Method used for evaluating particle size distribution of polymer microspheres, and method used for evaluating oil reservoir adaptability of polymer microspheres

Abstract

The invention belongs to the technical field of oil reservoir exploitation, and more specifically relates to a method used for evaluating particle size distribution of polymer microspheres, and a method used for evaluating oil reservoir adaptability of polymer microspheres. The method used for evaluating particle size distribution of polymer microspheres comprises following steps: 1, the number and the particle size of polymer microspheres in a certain area are calculated so as to obtain the largest particle size and the smallest particle size; 2, the obtained data is divided into a plurality of groups, and class interval width is calculated; 3, the limit of each group is calculated; 4, the frequency of the data of each group is calculated, and the frequency of each group is calculated; and 5, a microsphere particle size distribution curve is drawn. According to the method used for evaluating oil reservoir adaptability of polymer microspheres, evaluation of the oil reservoir adaptability of the polymer microspheres is carried out based on the matching relationship of the microsphere with pore size, core of different permeability is selected to measure the resistance coefficient and the residual resistance factor of the microspheres in passing through the core, if the microspheres are capable of entering core pores and performing transmission transporting, and the injection pressure increases firstly and then becomes stable, the geometric size of the microspheres matches the geometric size of the core pores, and the core permeability can be taken as the microsphere permeability extreme.

Description

Technical field: [0001] The invention belongs to the technical field of oil reservoir development, and in particular relates to an evaluation method for the particle size distribution of polymer microspheres and its oil reservoir adaptability. Background technique: [0002] Polymer flooding technology has become an important technical means of oil development because of its relatively simple technology, small equipment investment and large recovery rate increase. However, in the middle and late stages of polymer flooding, the phenomenon of "absorption profile inversion" caused by reservoir heterogeneity and polymer retention characteristics has seriously affected the development effect of polymer flooding. Polymer microspheres have the characteristics of strong deformation ability and narrow distribution range of microsphere particles. After entering the porous medium, they have the plugging characteristics of "blocking large but not small" and "capture-deformation-migration...

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Problems solved by technology

[0004] The present invention is to overcome the problem that the existing experimental research methods existing in the background technology are difficult to accurately reflect the particle size distribution of polymer microspheres and the adaptability of microsphere particle size and pores, and provide a particle size distribution of polymer microspheres and its oil The evaluation method of reservoir adaptability can provide important technical support for polymer microsphere deep control and flooding technology, and it is an evaluation method with simple process and obvious technical and economic effects

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